The structural design pursued the dual objective of achieving:

• a tank for the foundation and housing of the plant with a depth of about 4 metres from the p.p.f.
• the metal frame covering the tank and supporting the system.

The main work phases implemented to carry out the works were:

• DEMOLITION OF THE FLOORING AND EXCAVATION for the thickness of the future connection rail to the head of the poles.
• DRILLING AND LAYING OF MICRO-POLES pile wall: drilling and laying of 69 micro-poles along the subsequent excavation face with a diameter of 200 mm and reinforced with φ159×5.6mm steel tubing, placed at 50 cm intervals and varying in length between 6-8 metres.
• IMPLEMENTATION OF A PROVISIONAL METALLIC RAIL: the insertion of a HEA220 metal perimeter profile was foreseen by welding to the head of the poles, in order to allow collaboration between the poles themselves during the provisional phase; the profile was then drowned in the subsequent reinforced concrete rail with a permanent function.
• EXCAVATION UP TO LEVEL -4.40 metres
• ARMOURING AND CASTING OF FOUNDATION SLABS: a reinforced concrete base slab 40 cm thick was created after laying the 10 cm thick layer of lean concrete. Irons have been foreseen for the realization of the subsequent lining
• ARMOUR AND CAST ELEVATIONS: construction of the reinforced concrete lining 20 cm thick and the central reinforced concrete pillar 60×30 cm in size to support the system
• ARMOURING AND CASTING OF THE PERMANENT RAIL 50×50 cm connecting at the head of the poles
• LAYING OF A METAL FRAME to support the shot blasting machine, doweled to the reinforced concrete walls and to the final rail; the main profiles making up the frame are as follows:
  • 10 IPN400 profiles
  • 4 HEA400 profiles
  • Metal grating in 70×3 plates arranged in 25×76 mesh and frame in corner profiles.